--- parsetime.y.orig	2015-05-11 15:16:53.018305563 +0200
+++ parsetime.y	2015-05-11 15:17:22.820153470 +0200
@@ -6,6 +6,10 @@
 #include "parsetime.h"
 #include "panic.h"
 
+#ifndef __isleap
+#define __isleap(year) ((year)%4 == 0 && ((year)%100 != 0 || (year)%400 == 0))
+#endif
+
 #define YYDEBUG 1
 
 struct tm exectm;